Junior Alex Zhai is poised to represent the United States yet again in the International Math Olympiad. Last year he won a silver medal for the U.S. team, which placed fifth in the world out of 90 countries. Today, Zhai was named one of the 12 winners in the USA Math Olympiad. Only six of those 12 will be selected for the U.S. team, so Zhai still has some work to do.